diff --git a/tests/test_mime.js b/tests/test_mime.js
new file mode 100644
index 0000000..184edef
--- /dev/null
+++ b/tests/test_mime.js
@@ -0,0 +1,25 @@
+"use strict";
+// License: CC0 1.0
+
+// eslint-disable-next-line @typescript-eslint/no-var-requires
+const {MimeDB} = require("../lib/mime");
+
+describe("MIME", function() {
+  it("general", function() {
+    expect(MimeDB.getMime("image/jpeg").major).to.equal("image");
+    expect(MimeDB.getMime("image/jpeg").minor).to.equal("jpeg");
+    expect(MimeDB.getMime("iMage/jPeg").major).to.equal("image");
+    expect(MimeDB.getMime("imAge/jpEg").minor).to.equal("jpeg");
+  });
+
+  it("exts", function() {
+    expect(MimeDB.getMime("image/jpeg").primary).to.equal("jpg");
+    expect(MimeDB.getMime("image/jpeg").primary).to.equal(
+      MimeDB.getPrimary("image/jpeg"));
+    expect(MimeDB.getMime("iMage/jPeg").primary).to.equal("jpg");
+    expect(MimeDB.getMime("imAge/jpEg").primary).to.equal(
+      MimeDB.getPrimary("image/jpeg"));
+    expect(Array.from(MimeDB.getMime("imAge/jpEg").extensions)).to.deep.equal(
+      ["jpg", "jpeg", "jpe", "jfif"]);
+  });
+});